The following commands show examples how to list extension packs and remove one:
$ VBoxManage list extpacks Extension Packs: 1 Pack no. 0: Oracle Virtual Machine VirtualBox Extension Pack Version: 4.1.12 Revision: 77218 Edition: Description: USB 2.0 Host Controller, VirtualBox RDP, PXE ROM with E1000 support. VRDE Module: VBoxVRDP Usable: true Why unusable:
Now Remove or Uninstall extpack as following:
$ VBoxManage extpack uninstall "Oracle Virtual Machine VirtualBox Extension Pack" 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% Successfully uninstalled "Oracle Virtual Machine VirtualBox Extension Pack".